cache engine overloads, how to.....

i've cisco cache engine 505 attached with cisco 2611 router. Now whenever i reload my cache engine it performs its job for 5 minutes after that it overloads and cannnot perform its job and cache engine changes its state to bypass mode.

What could be the factors that causes this problem?

How can i avoid this problem.

this could be memory issue? if yes then which memory.hardisk or RAM or else?

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